CN116227610B - Ion trap system, electric field compensation method thereof and ion trap quantum computer - Google Patents
Ion trap system, electric field compensation method thereof and ion trap quantum computer Download PDFInfo
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Abstract
The invention discloses an ion trap system, an electric field compensation method thereof and an ion trap quantum computer. Wherein, the system includes radio frequency electrode and direct current electrode, and the method includes: applying a first voltage and a second voltage to the radio frequency electrode and the direct current electrode respectively, and recording to obtain first data; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are taken as final voltages, and electric field compensation of the ion trap system is realized by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned; the data comprises a plurality of different radio frequency frequencies and corresponding photon numbers, wherein the photon numbers are obtained by performing cooling laser irradiation on ions at the corresponding radio frequency and then performing fluorescence counting.
Description
Technical Field
The present invention relates to the field of ion trap systems, and in particular, to an ion trap system, an electric field compensation method thereof, and an ion trap quantum computer.
Background
An ion trap quantum computer needs to perform a series of preparation work before quantum computation is performed, and electric field compensation is a part of the preparation work. In an ion trap system for trapping ions by using a radio frequency electric field, the ions can feel radio frequency heating, so that the ions are in a state of being difficult to cool, long coherence time and state control are not facilitated, and electric field compensation is needed. The electric field compensation in the related art needs to continuously adjust the voltage and find a possible rule, and the compensation process is tedious and time-consuming, which wastes a lot of labor cost.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide an electric field compensation method for an ion trap system to realize automatic electric field compensation.
A second object of the present invention is to propose an ion trap system.
A third object of the present invention is to provide an ion trap quantum computer.
To achieve the above object, an embodiment of a first aspect of the present invention provides a method for electric field compensation of an ion trap system, the ion trap system including a radio frequency electrode and a dc electrode, the method comprising: applying a first voltage and a second voltage to the radio frequency electrode and the direct current electrode respectively, and recording to obtain first data; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if yes, taking the first voltage and the second voltage as final voltages, and utilizing the final voltages to realize electric field compensation of the ion trap system; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained; the first data, the second data and the third data all comprise a plurality of different radio frequency frequencies and photon numbers corresponding to the radio frequency frequencies, cooling laser irradiation is carried out on ions in the ion trap system for a first preset time aiming at each radio frequency, and then fluorescence counting is carried out within a second preset time to obtain the photon numbers corresponding to the radio frequency, wherein the first preset time is longer than the second preset time.
To achieve the above object, an embodiment of the present invention provides an ion trap system, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the computer program is executed by the processor to implement the method for compensating an electric field of the ion trap system.
To achieve the above object, an embodiment of a third aspect of the present invention provides an ion trap quantum computer, which includes the above ion trap system.
According to the ion trap system, the electric field compensation method thereof and the ion trap quantum computer, first data are recorded and obtained by respectively applying first voltage and second voltage to the radio-frequency electrode and the direct-current electrode; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are used as final voltages, and electric field compensation of the ion trap system is achieved by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained. Therefore, the radio frequency electrode is continuously adjusted through cyclic iteration, so that the optimal radio frequency electrode voltage is obtained, and automatic electric field compensation is realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flow diagram of a method of electric field compensation for an ion trap system in accordance with one or more embodiments of the present invention;
FIG. 2 is a schematic diagram of an exemplary method of electric field compensation for an ion trap system of the present invention;
FIG. 3 is a flow chart of an exemplary method of electric field compensation for an ion trap system of the present invention;
FIG. 4 is a flow chart of another exemplary method of electric field compensation for an ion trap system of the present invention;
fig. 5 is a flow chart of a method of electric field compensation for an ion trap system in accordance with yet another example of the present invention;
fig. 6 is a block diagram of an ion trap quantum computer of an embodiment of the present invention.
Detailed Description
An ion trap system, an electric field compensation method thereof, and an ion trap quantum computer according to embodiments of the present invention are described below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described with reference to the drawings are exemplary and should not be construed as limiting the invention.
Fig. 1 is a flow diagram of a method of electric field compensation for an ion trap system in accordance with one or more embodiments of the present invention.
The ion trap system comprises a plurality of electrodes, see fig. 2, n electrodes, ions, a laser control system and a voltage control system of the ion trap system, wherein the laser control system and the voltage control system are controlled by a synchronous control system, fluorescence emitted by the ions can be collected by a fluorescence collection system, and specific time sequence control can be seen in fig. 3. The plurality of electrodes include a Radio Frequency electrode, for example, an RF (Radio Frequency) chip electrode, and a Direct Current electrode, for example, a DC (Direct Current) chip electrode, see fig. 4. The ion trap system can be various ion trap systems for realizing quantum computation, such as a quadrupole trap, a ring cap trap, a blade trap, a chip trap and the like. The method can be applied to various ion trap systems such as Ca+, mg+, ba+, yb+, sr+, hg+, al+, in+, lu+.
As shown in fig. 1, the electric field compensation method of the ion trap system comprises the following steps:
s11, applying a first voltage and a second voltage to the radio frequency electrode and the direct current electrode respectively, and recording to obtain first data.
The first voltage is the maximum possible value of stably confining the ions, that is, the first voltage can ensure that the ions can be stably confined, but may exceed the actual requirement. The second voltage is an arbitrary value.
The first data comprise a plurality of different radio frequency frequencies and photon numbers corresponding to the radio frequency frequencies, cooling laser irradiation is carried out on ions in the ion trap system for a first preset time aiming at each radio frequency, and then fluorescence counting is carried out within a second preset time to obtain the photon numbers corresponding to the radio frequency, wherein the first preset time is longer than the second preset time.
Specifically, after the first voltage and the second voltage are applied to the radio frequency electrode and the direct current electrode, laser irradiation is performed on the ions, and the photon number emitted by the ions in the second preset time is collected. And adjusting the radio frequency of the radio frequency electrode through frequency sweep, and carrying out laser irradiation after each frequency adjustment to obtain photon number, thereby obtaining first data. After the first data are obtained, preset parameters including peak width, half-peak width and the like are needed to be obtained according to the first data, the peak width is taken as an example, a relation curve between radio frequency and photon number in the first data is also obtained after the first data are obtained, and the peak width is obtained according to the relation curve.
As an example, the trapped ions (which may be 1ms in duration) are irradiated by Doppler cooled laser (for example, a ca+ ion trap system, the Doppler cooled laser having a wavelength of 397 nm), followed by stopping the irradiation and collecting fluorescent counts (the number of photons emitted by the ions) over a period of time (which may be 500 us).
And adjusting the radio frequency of the radio frequency electrode through frequency sweep, and repeating the previous step after each frequency adjustment, thereby obtaining a curve L taking the radio frequency as an abscissa and taking the fluorescence count as an ordinate, and obtaining the peak width (or half-peak width) of the curve L. The smaller the peak width, the closer the ions are to the radio frequency zero.
And S12, adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data.
Specifically, after the voltage of the radio frequency electrode is adjusted to a first voltage and the voltage of the direct current electrode is adjusted to a second voltage, corresponding first data are recorded and obtained, the radio frequency electrode voltage and the direct current electrode voltage are adjusted according to the first data, updated first voltage and second voltage are obtained according to the adjusted radio frequency electrode voltage and direct current electrode voltage, and the radio frequency electrode voltage and the direct current electrode voltage are adjusted to the updated first voltage and second voltage. Recording to obtain second data.
The second data is obtained in the same manner as the first data.
S13, reducing the first voltage, and recording to obtain third data.
Specifically, after obtaining new rf electrode voltage and dc electrode voltage, the rf electrode voltage is first reduced once, and third data is recorded.
The third data is obtained in the same manner as the first data.
S14, judging whether the second data and the third data meet the first preset condition.
When the first preset condition is met, the ions can be considered to be at the radio frequency zero point, and the corresponding first voltage and second voltage can meet the electric field compensation requirement. As an example, the first preset condition is that the parameters such as the peak width and the half-peak width corresponding to the second data are smaller than or equal to the parameters corresponding to the third data, and if the description about the peak width indicates that the voltage of the radio frequency electrode is reduced for the first time, the peak width is not reduced or increased any more.
And S15, if the first voltage and the second voltage are met, the first voltage and the second voltage are taken as final voltages, and electric field compensation of the ion trap system is realized by utilizing the final voltages.
And S16, if the first voltage and the second voltage do not meet the first voltage, taking the third data as new first data, returning to the step of adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain the second data.
Specifically, if the second data and the third data obtained according to the adjusted first voltage and second voltage do not meet the first preset condition, the third data is used as new first data, and the first voltage and the second voltage are adjusted again, so that the first voltage and the second voltage meeting the requirements are obtained through continuous iteration.
Thus, first data are recorded and obtained by applying a first voltage and a second voltage to the radio frequency electrode and the direct current electrode respectively; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are used as final voltages, and electric field compensation of the ion trap system is achieved by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained. Therefore, through cyclic iteration, as shown in fig. 5, the radio frequency electrode is continuously adjusted, so that the optimal radio frequency electrode voltage is obtained, and electric field compensation is realized.
In one or more embodiments of the present invention, determining whether the second data and the third data satisfy the first preset condition includes: fitting according to a plurality of different radio frequency frequencies and the photon numbers corresponding to the radio frequency frequencies to obtain a corresponding relation curve, and obtaining the peak width of the corresponding relation curve; if the peak width corresponding to the second data is smaller than or equal to the peak width corresponding to the third data, determining that the second data and the third data meet the first preset condition.
In one or more embodiments of the present invention, adjusting and updating the first voltage according to the first data includes: and continuously reducing the first voltage, recording to obtain next first data until the first data obtained by two adjacent recordings meet a second preset condition, and updating the first voltage.
Specifically, when the first voltage is required to be adjusted and updated according to the first data, the voltage of the radio frequency electrode is continuously reduced, corresponding first data is required to be recorded and obtained once, and the first data obtained by two adjacent recordings are compared until the first data obtained by two adjacent recordings meets a second preset condition.
As an example, the second preset condition may be that parameters such as a peak width and a half-peak width corresponding to the first data obtained by the previous recording are smaller than parameters corresponding to the first data obtained by the subsequent recording, and if the description is given by the peak width, the radio frequency electrode voltage is reduced to a peak width increase, and for practical application, the radio frequency electrode voltage may also be set to be reduced to a peak width increase to a preset threshold.
After the first data meets the second preset condition, the first voltage corresponding to the first data meeting the second preset condition can be used as the radio frequency electrode voltage in the subsequent adjustment process.
Therefore, the adjustment of the radio frequency electrode voltage can be realized to obtain the optimal radio frequency electrode voltage.
In one or more embodiments of the invention, updating the first voltage includes: and acquiring first data obtained by the previous recording in the first data obtained by the two adjacent recordings, and taking the corresponding first voltage as the updated first voltage.
Specifically, when the first data obtained by two adjacent recordings meets a second preset condition, a first voltage corresponding to the first data obtained by the previous recording is obtained and is used as a radio frequency electrode voltage updating result.
In one or more embodiments of the invention, adjusting and updating the second voltage includes: after the first voltage is updated, the second voltage is adjusted, next first data is recorded and obtained until the first data obtained by two adjacent recordings meets a third preset condition, and the second voltage is updated.
Specifically, after the rf electrode voltage is adjusted, the dc electrode voltage needs to be adjusted. And adjusting the second voltage, recording to obtain first data, determining a second voltage adjustment mode according to the first data corresponding to the adjusted second voltage, adjusting the second voltage according to the determined second voltage adjustment mode, and recording to obtain first data after each adjustment until the first data obtained by recording two adjacent times meets a third preset condition. And updating the voltage of the direct current electrode according to the second voltage corresponding to the first data obtained by the two adjacent recordings.
As an example, the third preset condition may be that the parameters such as the peak width and the half-peak width corresponding to the first data obtained by the previous recording are smaller than or equal to the parameters corresponding to the first data obtained by the next recording, and if the above-mentioned peak width is described, that is, after the dc electrode voltage changes, the peak width is not reduced or increased any more.
If N pairs of dc electrodes exist, after the rf electrode voltage is adjusted, the first pair of dc electrode voltages is adjusted, the second pair of dc electrode voltages is adjusted, and the third pair of dc electrode voltages is adjusted, and the adjustment is repeated until the nth pair of dc electrode voltages is adjusted.
Thus, the voltage of the direct current electrode can be adjusted after the voltage of the radio frequency electrode is adjusted.
In one or more embodiments of the invention, adjusting the second voltage includes: increasing the second voltage, and recording to obtain corresponding first data; and adjusting the second voltage according to the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase.
Specifically, when the direct current electrode voltage is adjusted, the direct current electrode voltage is first increased, first data is recorded and obtained, and a second voltage adjustment mode is determined according to the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase.
In one or more embodiments of the present invention, adjusting the second voltage according to the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase includes:
if the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase meet the fourth preset condition, the second voltage is continuously increased, the corresponding next first data is recorded and obtained until the first data obtained by two adjacent recordings meet the third preset condition.
If the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase do not meet the fourth preset condition, the second voltage is reduced, the corresponding next first data is recorded and obtained until the first data obtained by two adjacent recordings meet the third preset condition.
The fourth preset condition may be that the parameters such as the peak width and the half-peak width corresponding to the second voltage before the increase are larger than the parameters corresponding to the second voltage after the increase, and if the peak width is taken as an example, when the dc electrode voltage is increased and the peak width is reduced, it is determined that the fourth preset condition is satisfied.
In one or more embodiments of the invention, updating the second voltage includes: and acquiring the first data obtained by the previous recording in the first data obtained by the two adjacent recordings, and taking the corresponding second voltage as the updated second voltage.
Specifically, when the first data obtained by two adjacent recordings meets a third preset condition, obtaining a second voltage corresponding to the first data obtained by the previous recording, and taking the second voltage as a direct current electrode voltage updating result.
As an example, after increasing the voltage of the dc electrode, if the peak width decreases, the voltage is continuously increased until the voltage increases, the peak width is no longer decreased or increased, and the voltage value after the penultimate adjustment is used as the voltage adjustment end point value of the dc electrode.
If the voltage of the direct current electrode increases and the peak width increases, the voltage is reduced until the voltage is reduced, the peak width is not reduced or increased any more, and the voltage value after the last-last adjustment is used as the voltage adjustment end point value of the first pair of electrodes.
The above method is described below with reference to a specific example.
In this example, 5 pairs of DC chip electrodes and 1 pair of RF chip electrodes are included.
Step 1: while the voltage of each electrode is maintained at a fixed value, the trapped ions (which may be 1 ms) are irradiated by a Doppler cooling laser (for example, a ca+ ion trap system, the wavelength of the Doppler cooling laser is 397 nm), then the irradiation is stopped, and the fluorescence count (the number of photons emitted by the ions) is collected for a certain period of time (which may be 500 us).
And (3) adjusting the radio frequency of the radio frequency electrode through frequency sweep, and repeating the previous step after each frequency adjustment, so as to obtain a curve L taking the radio frequency as an abscissa and taking the fluorescence count as an ordinate, and obtaining the peak width (or half-peak width) d of the curve L.
Step 2.1, setting the rf electrode voltage to the maximum possible value for stably confining the ions (i.e. the value ensures that the ions can be stably confined, but possibly beyond the actual requirement).
Step 2.2, gradually reducing the voltage of the radio frequency electrode, repeating the operation of the step 1 every time the voltage is reduced, and obtaining the peak width (or half-peak width) d of the curve L.
And the voltage of the radio frequency electrode is reduced to d and increased or increased to a target threshold value, and the voltage value after the penultimate regulation is used as the voltage regulation endpoint value of the radio frequency electrode.
And 2.3, adjusting the first pair of direct current electrodes, and repeating the operation of the step 1 after each adjustment to obtain d.
If the electrode voltage increases and d decreases, the voltage continues to increase until the voltage increases, d no longer decreases or increases, and the voltage value after the penultimate adjustment is used as the voltage adjustment end point value of the first pair of electrodes.
If the electrode voltage increases and d increases, the voltage is reduced until the voltage decreases, d no longer decreases or increases, and the voltage value after the penultimate adjustment is used as the voltage adjustment end point value of the first pair of electrodes.
And similarly, regulating the voltage of the second, third and 5 th pairs of direct current electrodes according to the process, and finding out the voltage regulation end point value of each pair of direct current electrodes.
The steps 2.2 and 2.3 are repeated until the voltage of the radio frequency electrode is reduced for the first time, so that d is not reduced or increased any more.
In summary, according to the electric field compensation method of the ion trap system, the first data are recorded and obtained by respectively applying the first voltage and the second voltage to the radio frequency electrode and the direct current electrode; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are used as final voltages, and electric field compensation of the ion trap system is achieved by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained. Therefore, the radio frequency electrode is continuously adjusted through cyclic iteration, so that the optimal radio frequency electrode voltage is obtained, and automatic electric field compensation is realized.
Further, the invention provides an ion trap system.
In an embodiment of the present invention, an ion trap system includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the method for electric field compensation of the ion trap system.
According to the ion trap system provided by the embodiment of the invention, the first voltage and the second voltage are respectively applied to the radio frequency electrode and the direct current electrode by realizing the electric field compensation method of the ion trap system, and the first data are recorded and obtained; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are used as final voltages, and electric field compensation of the ion trap system is achieved by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained. Therefore, the radio frequency electrode is continuously adjusted through cyclic iteration, so that the optimal radio frequency electrode voltage is obtained, and automatic electric field compensation is realized.
Furthermore, the invention provides an ion trap quantum computer.
Fig. 6 is a block diagram of an ion trap quantum computer of an embodiment of the present invention.
As shown in fig. 6, an ion trap quantum computer 10 includes an ion trap system 100 as described above.
According to the ion trap quantum computer provided by the embodiment of the invention, the first voltage and the second voltage are respectively applied to the radio frequency electrode and the direct current electrode through the ion trap system, and the first data are recorded and obtained; adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data; reducing the first voltage, and recording to obtain third data; judging whether the second data and the third data meet a first preset condition or not; if the first voltage and the second voltage are met, the first voltage and the second voltage are used as final voltages, and electric field compensation of the ion trap system is achieved by utilizing the final voltages; if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained. Therefore, the radio frequency electrode is continuously adjusted through cyclic iteration, so that the optimal radio frequency electrode voltage is obtained, and automatic electric field compensation is realized.
It should be noted that the logic and/or steps represented in the flow diagrams or otherwise described herein may be considered a ordered listing of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present specification, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. refer to an orientation or positional relationship based on that shown in the drawings, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, unless otherwise indicated, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A method of electric field compensation for an ion trap system, the ion trap system comprising a radio frequency electrode and a dc electrode, the method comprising:
applying a first voltage and a second voltage to the radio frequency electrode and the direct current electrode respectively, and recording to obtain first data;
adjusting and updating the first voltage and the second voltage according to the first data, and recording to obtain second data;
reducing the first voltage, and recording to obtain third data;
judging whether the second data and the third data meet a first preset condition or not;
if yes, taking the first voltage and the second voltage as final voltages, and utilizing the final voltages to realize electric field compensation of the ion trap system;
if not, the third data is used as new first data, and the step of adjusting and updating the first voltage and the second voltage according to the first data is returned, and the second data is recorded and obtained;
the first data, the second data and the third data all comprise a plurality of different radio frequency frequencies and photon numbers corresponding to the radio frequency frequencies, cooling laser irradiation is carried out on ions in the ion trap system for a first preset time aiming at each radio frequency, and fluorescence counting is carried out within a second preset time to obtain the photon numbers corresponding to the radio frequency, wherein the first preset time is longer than the second preset time;
the judging whether the second data and the third data meet a first preset condition comprises the following steps:
fitting according to the plurality of different radio frequency frequencies and the corresponding photon numbers to obtain a corresponding relation curve, and obtaining the peak width of the corresponding relation curve;
and if the peak width corresponding to the second data is smaller than or equal to the peak width corresponding to the third data, determining that the second data and the third data meet a first preset condition.
2. The method of claim 1, wherein adjusting and updating the first voltage based on the first data comprises:
reducing the first voltage, recording to obtain next first data until the first data obtained by two adjacent recordings meet a second preset condition, and updating the first voltage;
wherein the second preset condition includes:
the peak width corresponding to the first data obtained by the previous record is smaller than the peak width corresponding to the first data obtained by the next record.
3. The method of claim 2, wherein adjusting and updating the second voltage comprises:
after the first voltage is updated, the second voltage is adjusted, next first data are recorded and obtained, and the second voltage is updated until the first data obtained by two adjacent recordings meet a third preset condition;
wherein the third preset condition includes:
the peak width corresponding to the first data obtained by the previous record is smaller than or equal to the peak width corresponding to the first data obtained by the next record.
4. The method of claim 3, wherein updating the first voltage comprises:
acquiring first data obtained by the previous recording in the first data obtained by the two adjacent recordings, and taking the corresponding first voltage as the updated first voltage;
updating the second voltage, comprising:
and acquiring first data obtained by the previous recording in the first data obtained by the two adjacent recordings, and taking the corresponding second voltage as the updated second voltage.
5. The method of claim 3, wherein adjusting the second voltage comprises:
increasing the second voltage, and recording to obtain corresponding first data;
and adjusting the second voltage according to the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase.
6. The method of claim 5, wherein adjusting the second voltage according to the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase comprises:
if the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase meet a fourth preset condition, continuing to increase the second voltage, and recording to obtain the corresponding next first data until the first data obtained by two adjacent recordings meet the third preset condition.
7. The method of claim 6, wherein the adjusting the second voltage according to the first data corresponding to the second voltage before the increasing and the first data corresponding to the second voltage after the increasing, further comprises:
and if the fourth preset condition is not met between the first data corresponding to the second voltage before the increase and the first data corresponding to the second voltage after the increase, the second voltage is reduced, the corresponding next first data is recorded and obtained until the first data obtained by two adjacent recordings meets the third preset condition.
8. An ion trap system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the ion trap system electric field compensation method of any of claims 1-7.
9. An ion trap quantum computer comprising the ion trap system of claim 8.
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